Thermostat - Derbi GP1 50 cc Workshop Manual

Using the air heater, warm up the water pump bearing
housing, without directing the air flux directly aginst the oil
seal.
- Lubricate the end of the water pump shaft on the oil seal
side, using the recommended product.
Recommended products
Lithium soap grease NLGI 33

THERMOSTAT

R
EMOVAL O
- Detach the coolant hose from the head, partially draining
the system.
- Remove the cylinder head.
- Remove the two fixing screws and hence the thermostat.
C C
HECK HECK
1) Visually ensure the thermostat is not damaged.
2) Fill a metallic container with approx. 1 litre of water.
Immerge the thermostat, and keep it in the centre of the
bowl.
Immerge the multimeter temperature probe, and keep it clo-
se to the thermostat.
Heat up the bowl using the air heater.
Check the thermostat opening start temperature:
Heat up until the thermostat is completely open.
3) Replace the thermostat if not working properly.
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